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. 2017 Nov 13;7:15398. doi: 10.1038/s41598-017-15826-3

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Polarisation state. Output polarisation of Q-switched laser analysed using quarter-wave (λ/4) plate and analyser. The ideal linearly polarised state is indicated by the black dashed line. Without the λ/4 plate, the transmitted power showed no dependency on the analyser angle (solid black line). The polarisation state using the λ/4 plate is plotted by the bold orange line. The polarisation state remained constant with rotation of the λ/4 plate, indicating that the output pulse was not circularly but randomly polarised.